Phase fluctuations in anisotropic Bose condensates: from cigars to rings

We study the phase-fluctuating condensate regime of ultra-cold atoms trapped in a ring-shaped trap geometry, which has been realized in recent experiments. We first consider a simplified box geometry, in which we identify the conditions to create a state that is dominated by thermal phase-fluctuatio...

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Bibliographic Details
Published inarXiv.org
Main Authors Mathey, L, Ramanathan, A, Wright, K C, Muniz, S R, Phillips, W D, Clark, Charles W
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 21.08.2010
Subjects
Atomic properties
Cold traps
Condensates
Geometry
Physics - Quantum Gases
Physics - Quantum Physics
Ultracold atoms
Variation
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Summary:We study the phase-fluctuating condensate regime of ultra-cold atoms trapped in a ring-shaped trap geometry, which has been realized in recent experiments. We first consider a simplified box geometry, in which we identify the conditions to create a state that is dominated by thermal phase-fluctuations, and then explore the experimental ring geometry. In both cases we demonstrate that the requirement for strong phase fluctuations can be expressed in terms of the total number of atoms and the geometric length scales of the trap only. For the ring-shaped trap we discuss the zero temperature limit in which a condensate is realized where the phase is fluctuating due to interactions and quantum fluctuations. We also address possible ways of detecting the phase fluctuating regime in ring condensates.
ISSN:2331-8422
DOI:10.48550/arxiv.1007.0281